FR832795A - Receiving amplifier combined with a signaling device for telephone transmissions - Google Patents

Receiving amplifier combined with a signaling device for telephone transmissions

Info

Publication number
FR832795A
FR832795A FR832795DA FR832795A FR 832795 A FR832795 A FR 832795A FR 832795D A FR832795D A FR 832795DA FR 832795 A FR832795 A FR 832795A
Authority
FR
France
Prior art keywords
signaling device
receiving amplifier
telephone transmissions
amplifier combined
transmissions
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
Other languages
French (fr)
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Application granted granted Critical
Publication of FR832795A publication Critical patent/FR832795A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents
    • H04Q1/44—Signalling arrangements; Manipulation of signalling currents using alternate current
    • H04Q1/444—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies
    • H04Q1/446—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency
    • H04Q1/4465—Signalling arrangements; Manipulation of signalling currents using alternate current with voice-band signalling frequencies using one signalling frequency the same frequency being used for all signalling information, e.g. A.C. nr.9 system

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Devices For Supply Of Signal Current (AREA)
  • Amplifiers (AREA)
FR832795D 1937-01-29 1938-01-29 Receiving amplifier combined with a signaling device for telephone transmissions Expired FR832795A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201132X 1937-01-29

Publications (1)

Publication Number Publication Date
FR832795A true FR832795A (en) 1938-10-03

Family

ID=5764685

Family Applications (1)

Application Number Title Priority Date Filing Date
FR832795D Expired FR832795A (en) 1937-01-29 1938-01-29 Receiving amplifier combined with a signaling device for telephone transmissions

Country Status (4)

Country Link
US (1) US2251958A (en)
CH (1) CH201132A (en)
FR (1) FR832795A (en)
GB (1) GB487488A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR963277A (en) * 1947-02-21 1950-07-05
DE1063220B (en) * 1954-12-16 1959-08-13 Sueddeutsche Telefon App Kabel Tonrufempfaenger or converter for tone selection or tone control purposes for radio systems with selective call systems, in particular for radio networks with mobile radio systems
SG137753A1 (en) * 2006-05-24 2007-12-28 Inventio Ag Elevator with frictional drive

Also Published As

Publication number Publication date
CH201132A (en) 1938-11-15
US2251958A (en) 1941-08-12
GB487488A (en) 1938-06-21

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